09-07-2011, 01:47 AM
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If 55 gallon tank is moderately stocked with small to middlin size cichlid's,then your XP2 at close to 300 gal per hour (a bit less with media added) should be up to the task,only you can determine if this is the case.
I usually judge this by how long it takes for water to clear after gravel vaccuming.
If water is clear within twenty minutes, I consider the filtration sufficient for fish load.
If fishes were larger, six to eight inch cichlid's,, then I would consider the XP4.
Cichlid's are messy fishes, and anyone who has watched them eat, will note that nearly half of that which they take in through their mouth's is crushed within, and much escapes across their gills and fall's back onto the floor of aquarium.They also produce considerable amount of waste(poop) compared to other smaller fishes so in my view,,, it is beneficial to have vigorous water movement to help keep waste in the water column where it can be grabbed by the filter as opposed to laying on substrate between water changes.
You have roughly five times the volume of water the tank holds being filtered each hour presently, and if as mentioned, fishes are smallish, and not too numerous,,then your present filter maintained regularly, may be sufficient.(your call)
For me,,I would select the XP4 simply cause overfiltering with cichlid's I have kept ,produced the desired result's.
P.S. Should you decide to replace the XP2, I would use sizeable amount of media from the XP2 to seed the new filter before removing the old one, and would monitor the water (ammonia level's) closely while feeding a bit less for the first couple weeks.
Last edited by 1077; 09-07-2011 at 01:52 AM..